Out of first 100 elements no. of elements having electrons ... · The element having electronic configuration 4f14 5d0 6s2 belongs to (A) d-block, 12th group (B) f-block, III B group

Out of first 100 elements no. of elements having electrons in

3d orbitals (in their complete electronic configuration) are

(A) 80

(B) 100

(C) 40

(D) 60.

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01

Sixth typical element is

(A) Al

(B) Mg

(C) S

(D) O.


02

The group number for the I A to IV A group elements gives

the

(A) Effective nuclear charge

(B) Valency of elements

(C) Number of elements in the group

(D) Value of n for the valence shell.


03

Which of the following electronic configurations in the

outermost shell is characteristic of alkali metals

(A) (n – 1) s2p6 ns2p1

(B) (n – 1) s2p6d10 ns1

(C) (n – 1) s2p6ns1

(D) ns2np6 (n – 1) d10


04

The element having electronic configuration 4f14 5d0 6s2

belongs to

(A) d-block, 12th group

(B) f-block, III B group

(C) f-block, 14th group

(D) s-block, 2nd group


05

The fourteen elements collectively placed in 3rd group and 7th

period are called

(A) Typical elements

(B) Representative element

(C) Actinides

(D) Lanthenones.


06

Which of the following statement is wrong for the transition

elements

(A) Transition elements are placed from 3rd to 6th period

(B) Last electron enters in (n – 1)d orbital

(C) Exhibits variable valency

(D) General electronic configuration is (n – 1)d1–10 ns1,2.


07

Which of the following general electronic configuration for

transition elements is not correct

(A) (n + 1) s1–2 nd1–10

(B) ns1–2 (n – 1)d1–10 (Where n = 2, 3, 4 ........)

(C) ns0,1,2(n – 1)s2 p6 d1–10

(D) (n – 1)d1–10 ns0–2


08

True statement is

(A) All the transuranic elements are synthetic elements

(B) Elements of third group are called bridge elements

(C) Element of 1s2 configuration is placed in IIA group

(D) Electronic configuration of elements of a group is same.


09

Which of the following matches are wrong

(a) Cm96 – actinide element

(b) U92 – Lw103 Transurnic elements

(c) Pm61 – Man made element

(d) Ar – Kr Anomalous pair

Correct answer is

(A) a, c (B) b, d

(C) a, b (D) Only d.


10

Elements having ns2 np6 valence shell electronic configuration

lies in

(A) ‘O’ gp. and 1st – 7th period

(B) 18th gp. and 2nd – 6th period

(C) 18th gp. and 1st – 6th period

(D) All are correct.


11

Certain regular intervals after which the outer electronic

configuration of the elements occur are called

(A) Gold number

(B) Atomic numbers

(C) Magic numbers

(D) Avogadro number.


12

The electronic configuration of four elements are given below.

Which element does not belong to the same block as others

(A) [Xe] 6s2 4f14 5d10

(B) [Ar] 4s2 3d5

(C) [Rn] 7s2 5f7 6d1

(D) [Kr] 4d6 5s2


13

Which of the following match is correct

(A) Last natural element – Uub

(B) General electronic configuration of IA group – ns2

(C) Inert gas element lies in 2nd – 6th period

(D) Typical elements – 3rd period elements.


14

Which of the following statement is wrong

(A) All the actinides are synthetic (man made) elements

(B) In the Lanthanides last electron enters in 4f orbitals

(C) Np93 onwards are transuranic elements

(D) Lanthenum is d-block element.


15

If the ionic radii of KÅ and FQ are nearly the same (i.e. 1.34 Å)

then the atomic radii of K and F respectively are

(A) 1.34 Å, 1.34 Å

(B) 0.72 Å, 1.96 Å

(C) 1.96 Å, 0.72 Å

(D) 1.96 Å, 1.34 Å


16

Which is correct order of size of O,O2–, F– and F

(A) O2– > O > F– > F

(B) O > O2– > F > F–

(C) O2– > F– > F > O

(D) O2– > F– > O > F.


17

In which of the following pairs, both the species have nearly

the same size

(A) Al, Ga

(B) Li+, Mg2+

(C) Fe, Co

(D) All the three.


18

The second ionisation potentials in electron volts of oxygen

and fluorine atoms are respectively given by

(A) 35.1, 38.3

(B) 38.3, 38.3

(C) 38.3, 35.1

(D) 35.1, 35.1


19

A sudden large jump between the values of 2nd and 3rd IP of an

element would be associated with the electronic configuration

(A) 1s2, 2s2 2p6, 3s1

(B) 1s2, 2s2 2p6, 3s2 3p5

(C) 1s2, 2s2 2p6, 3s2 3p2

(D) 1s2, 2s2 2p6 3s2.


20

The IP1, IP2, IP3, IP4 and IP5 of an element are 7.1, 14.3, 34.5,

46.8, 162.2 eV respectively. The element is likely to be

(A) Na

(B) Si

(C) F

(D) Ca.


21

Which of the following has 2nd IP < 1st IP

(A) Mg

(B) Ne

(C) C

(D) None.


22

Among the following elements (Whose electronic configuration

is give below) the one having the highest ionisation energy is

(A) [Ne] 3s2 3p3

(B) [Ne] 3s2 3p4

(C) [Ne] 3s2 3p5

(D) [Ne] 3s2


23

Element X, Y and Z have atomic numbers 19, 37 and 55

respectively. Which of the following statements is true

(A) Their ionisation potential would increase with the

increasing atomic number

(B) ‘Y’ would have an ionisation potential in between those

of ‘X’ and ‘Z’

(C) ‘Z’would have the highest ionisation potential

(D) ‘Y’would have the highest ionisation potential.


24

The first (IE1) and second (IE2) ionization energies (kJ/mol) of

a few elements designated by Roman numerals are given

below. Which of these would be an alkali metal ?

IE1 IE2

(A) I 2372 5251

(B) II 520 7300

(C) III 900 1760

(D) IV 1680 3380


25

The correct order of second ionization potential of C, N, O

and F is

(A) C > N > O > F

(B) O > N > F > C

(C) O > F > N > C

(D) F > O > N > C.


26

The correct values of ionization enthalpies (in kJ mol–1) of Si,

P, Cl and S respectively are

(A) 786, 1012, 999, 1256

(B) 1012, 786, 999, 1256

(C) 786, 1012, 1256, 999

(D) 786, 999, 1012, 1256.


27

Which of the following is an amphoteric oxide ?

(A) MgO

(B) Al2O3

(C) SiO2

(D) P2O5


28

The first ionisation potentials of four consecutive elements

present in the second period of periodic table are 8.3, 11.3,

14.5 and 13.6 eV respectively which one of the following is

the first ionisation potential of nitrogen ?

(A) 13.6 (B) 14.5

(C) 11.3 (D) 8.3


29

The first ionisation energy of Mg, Al, P and S follows the

order

(A) Mg < Al < P < S

(B) Al < Mg < P < S

(C) Al < Mg < S < P

(D) Mg < Al < S < P.


30

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Out of first 100 elements no. of elements having electrons ... · The element having electronic configuration 4f14 5d0 6s2 belongs to (A) d-block, 12th group (B) f-block, III B group